Undo changes to trailing triple quotes in docstring

var/spack/repos/builtin/packages/xerces-c/package.py

@@ -30,7 +30,8 @@ class XercesC(Package):
     C++. Xerces-C++ makes it easy to give your application the ability to read
     and write XML data. A shared library is provided for parsing, generating,
     manipulating, and validating XML documents using the DOM, SAX, and SAX2
-    APIs."""
+    APIs.
+    """
 
     homepage = "https://xerces.apache.org/xerces-c"
     url      = "https://www.apache.org/dist/xerces/c/3/sources/xerces-c-3.1.4.tar.bz2"